Penalties for Filing Taxes Late (and Paying Late)

If you file your federal return late and owe tax, the IRS charges a failure-to-file penalty of 5% of the unpaid tax for each month or part of a month the return is late, up to 25%. Paying late adds a separate failure-to-pay penalty of 0.5% a month, also capped at 25%, and interest runs on both the tax and the penalties until everything is paid.

The filing penalty is ten times the payment penalty, which leads to the single most useful rule in this article: if you can't pay, file anyway, on time or on extension. If you are owed a refund, there is no late-filing penalty, but you can lose the refund altogether after three years.

The failure-to-file penalty

The IRS figures it in three steps: take the tax required to be shown on the return, subtract any payments made on time and refundable credits, and multiply the remaining unpaid tax by 5% for each month or partial month after the due date (including any extension). A return filed one day late counts as one month.

The minimum penalty for returns more than 60 days late

Once a return is more than 60 days late, a floor applies: the penalty is at least a set dollar amount or 100% of the tax due, whichever is less.

• Returns due in 2026 (generally your 2025 return): $525.
• Returns due in 2027 (generally your 2026 return): $535, per Rev. Proc. 2025-32.

For a small balance, this floor can make the penalty equal to the entire tax. If your 2025 return showed $300 of unpaid tax and you filed it four months late, the percentage calculation would give about $60, but the minimum rule makes the failure-to-file penalty $300.

The failure-to-pay penalty

This one applies to tax shown on the return that isn't paid by the original due date. It is 0.5% of the unpaid tax for each month or part of a month, up to 25%, with two adjustments:

• Reduced to 0.25% a month while you have an approved payment plan, if you are an individual who filed on time.
• Increased to 1% a month if you still haven't paid 10 days after receiving an IRS notice of intent to levy.

An extension to file is not an extension to pay. Form 4868 moves your filing deadline by six months, but tax not paid by the April due date starts accruing the failure-to-pay penalty and interest from that date.

When both penalties apply in the same month

For any month both penalties apply, the failure-to-file penalty is reduced by the failure-to-pay amount. In practice that means a combined 5% a month for the first five months (4.5% for filing late plus 0.5% for paying late). After five months the failure-to-file penalty has hit its 25% maximum and stops, while the failure-to-pay penalty keeps running at 0.5% a month until it, too, reaches 25%. Left alone long enough, the two can reach 47.5% of the original tax before interest.

Interest on top of penalties

Interest is charged on unpaid tax from the due date and on penalties as well. The rate for individuals is the federal short-term rate plus 3 percentage points, reset every quarter and compounded daily. For October to December 2026 it is 7% a year. Interest can be reduced only if the penalty it relates to is reduced or removed, so it usually stays even when penalties are waived.

Worked example: an Atlanta caterer who missed April

Carla runs a catering business as a sole proprietor. Her 2025 return was due April 15, 2026. She didn't file an extension and finally filed and paid on August 20, 2026, with $8,000 of tax unpaid after her estimated payments.

1. Count the months. April 16 to August 20 covers four full months and part of a fifth, so five months.
2. Failure-to-pay penalty: 0.5% x 5 months = 2.5% of $8,000 = $200.
3. Failure-to-file penalty before the offset: 5% x 5 months = 25% of $8,000 = $2,000.
4. Offset for months both applied: $2,000 minus $200 = $1,800. It exceeds the $525 minimum, so the minimum rule doesn't change anything.
5. Total penalties: $1,800 + $200 = $2,000, plus interest on the $8,000 and on the penalties from the relevant dates.

Now run the same facts with one change: Carla files Form 4868 by April 15 and then files her return on August 20, inside the extension. She still owes the $200 failure-to-pay penalty and interest, but there is no failure-to-file penalty. A five-minute extension request would have saved her $1,800.

How long can you go without filing taxes?

There is no point at which an unfiled return stops mattering. Several clocks run differently once you skip a year:

• No time limit on assessment. Normally the IRS has three years after the due date to assess more tax. If you never file a required return, it can assess tax at any time, often by preparing a substitute return for you that ignores deductions and credits you could have claimed.
• Refunds expire. To claim a refund of withholding or estimated payments, you must file within three years of the return's due date. After that, the money is gone.
• Six years is the usual enforcement window. Under IRS Policy Statement 5-133, delinquent-return enforcement normally covers no more than six years, and going further requires managerial approval. That is internal policy, not a legal limit, and it doesn't apply the same way where fraud is suspected.
• Social Security credits. If you are self-employed and don't file, your self-employment income isn't reported to the Social Security Administration, so it doesn't count toward your retirement or disability benefits.

If you are behind, file the most recent years first, pay what you can, and set up a payment plan for the rest. Filing stops the failure-to-file penalty growing on those years, and each payment shrinks the balance that the failure-to-pay penalty and interest are charged on.

Business returns have their own late-filing penalties

Partnerships and S corporations usually owe no entity-level income tax, but they still face late-filing penalties charged per partner or shareholder for each month the return is late, up to 12 months. For Forms 1065 and 1120-S required to be filed in 2027, the per-person monthly amount is $260 (Rev. Proc. 2025-32). Late or incorrect information returns such as 1099s carry separate penalties.

How to get late penalties reduced

• First-time abatement. The IRS may waive failure-to-file, failure-to-pay and failure-to-deposit penalties for one period if you have a clean recent record: the same type of return filed on time for the prior three years, and no penalties in that period other than an estimated tax penalty (or any that were removed for reasonable cause or IRS error).
• Reasonable cause. If you acted in good faith and something outside your control stopped you, such as a serious illness or a disaster, you can ask for penalty relief and explain the facts.
• Disaster relief. When the IRS announces disaster relief for your area, it postpones deadlines automatically for affected taxpayers.

Common mistakes

• Not filing because you can't pay, which multiplies the penalty tenfold.
• Assuming an extension covers payment.
• Treating the six-year practice as a statute of limitations.
• Waiting years to claim a refund and losing it after the three-year window.

hellobooks< / a > -helps-you-file-on-time">How HelloBooks helps you file on time

Late returns usually start with late books. HelloBooks keeps your business records current so the return isn't blocked by a shoebox of receipts: bank feeds and AI categorization (which you review) keep transactions up to date, receipt OCR captures expenses from your phone, and the P&L and balance sheet are ready whenever your preparer asks. If you are catching up on prior years, the one-time migration import and bank reconciliation help rebuild a clean ledger, and the reports export to CSV for whoever prepares the return.

General information as of November 2026, not tax or legal advice. Penalty amounts and interest rates change; confirm them on irs.gov or with a CPA or enrolled agent for your situation.